JPS6335253B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is aimed at preventing diseases caused by ruminant animals, especially cattle, swallowing and accidentally ingesting metal foreign objects with feed, and causing these metal foreign objects to puncture and irritate the stomach wall. The present invention relates to a ring-shaped magnet for preventing foreign bodies in the stomach from being attracted.

[Conventional technology]

Ruminants, especially cows, often accidentally ingest sharp metal foreign objects such as wires and nails mixed in their feed, and these accidentally ingested metal foreign objects become attached to the gastric wall (first part) as the stomach contracts and relaxes. By puncturing and stimulating the digastric wall), gastritis and damage to adjacent organs, such as the diaphragm, heart, liver, etc., are caused.
Many of them result in death or disuse.

In contrast, in the past, bar magnets, magnets with longitudinal grooves on the outer circumferential surface, magnets with protective tubes on the outer surface of bar magnets, etc. were orally administered to cattle, and metal foreign objects were placed in the magnets. I was trying to make it absorb.

However, even when conventional magnets attract large, curved metal foreign objects, they are not able to hold them completely, and they may be detached due to the strong contractions and relaxation movements of the stomach, as well as contact with the food bolus at that time. I tend to do that. Furthermore, it is rare for a foreign metal object to be attracted to a magnet in a reclining manner with a large contact area;
Most of them had curved ends that protruded outward in a sharp shape, and there was a risk that this sharply protruded end would puncture the stomach wall. On the other hand, Utility Model Application No. 58-24280 (Utility Model Publication No. 61-25778) discloses a means for accommodating metal foreign matter within the ring of a ring-shaped magnet made of a rod-shaped magnet material and integrally formed into a vertically long annular shape. It has been proposed in

[Problem that the invention seeks to solve]

The above proposal has an excellent shape in terms of reliably adsorbing and trapping metal foreign objects in the internal space, but the present invention further studies the distribution of magnetic lines of force and creates a structure in which the density of magnetic lines of force is particularly high inside the space. It is magnetized and reliably captures metal foreign matter in the space.

[Means for Solving Problems] and [Operation] The present invention is a vertically elongated ring-shaped magnet made of a rod-shaped magnet material and integrally formed into an annular shape, and in which a magnet is formed between the magnetic poles provided at both ends in the length direction. are each provided with magnetic poles surrounding at least one pair of magnet materials.

That is, the present invention provides a conventional ring-shaped magnet in which magnetic poles are provided at both ends of a slightly flat ring-shaped magnet, in which at least one pair of magnetic poles are provided between the magnetic poles.
Each has annular magnetic poles surrounding the magnet material,
A uniform magnetic attraction force is placed around the ring-shaped magnet, and the magnetic flux density becomes particularly high in the space due to the restrictions caused by the closed shape. Therefore, the metallic foreign matter is attracted to the outer periphery of the magnet by the magnetic attraction around the magnet, and then moved further into the space by the stronger magnetic attraction in the space.

The present invention will be specifically described below with reference to Examples.

FIG. 1 is a plan view of a ring-shaped magnet made by integrally molding a magnet material made of Alnico 5 with a circular cross section into a slightly flat annular shape. This magnet 1 is a magnet with a length of about 12 cm, with the elongated tip 2 magnetized to the north pole and the tip 3 to the south pole using a normal magnetizing device. The magnetic flux density at both ends was 1500G. In order to provide other magnetic poles, the ring-shaped magnet is covered with three sets of sleeves 4 as shown by two-dot chain lines in FIG. The sleeve 4 is made of a material with high magnetic permeability, such as pure iron, and surrounds the ring-shaped magnet in close contact with it. For example, as shown in FIG. 2, the sleeve 4a may be divided into upper and lower sleeve pieces, with a gap 5 provided therein that matches the tip 3 of the ring-shaped magnet 1 and accommodates the magnet. In use, one end of the ring-shaped magnet is inserted into the gap 5, and the upper and lower sleeve pieces are tightly fixed. The sleeve 4c may also have the same shape as the sleeve 4a,
The sleeve 5b used had a gap 5 passing through the sleeve piece. The sleeves 4a, 4b, and 4c were not brought into close contact with each other, but were attached to a ring-shaped magnet with a gap 6 sufficient for magnetic poles, which in this example was 0.7 mm. 7 is a space surrounded by a ring-shaped magnet. With the sleeve 4 attached in this manner, it was magnetized using a known magnetizing device with a direct current of 3 KA. As a result, the entire circumference of the gap 6 between the sleeves made of magnetic material became a magnetic pole, and a magnetic flux distribution as shown by the thin line in FIG. 1 was obtained. The magnetic flux density at both ends is 1000G, and the part with interval 6 is each
It was 500G.

The thus obtained magnet of the present invention has a magnetic flux distribution as shown by the thin line in Figure 1, and even though the magnetic flux density between the N and S poles is the same, it is not blocked at the inner periphery of the ring-shaped magnet. Due to the elongated shape of the space, the magnetic flux density was particularly high, and the ability to attract metal foreign matter into the space increased. Furthermore, even if a foreign metal object remains attracted to the outer periphery of the magnet, the magnetic flux density around the outer periphery of the magnet is almost uniform, so the patient lies in close contact with the periphery of the magnet, and does not irritate the stomach wall.

In this embodiment, the space has a flat shape, and the outer shell is an annular magnet having a flat elliptical outer shell. The magnet material forming the annular shape is a known magnet material such as alnico or ferrite, and its cross-sectional shape is not particularly limited, such as circular, square, or elliptical. It only needs to have a flat shape that can be passed through. However, if it is too narrow, the space in the center will not be wide enough to hold a large, curved metal foreign object, and the function of the present invention will not be achieved. Therefore, it is preferable that the magnet be surrounded by a flat, slightly tapered annular bar magnet material, leaving a slightly flat space. The shape of the space is not particularly limited, such as an ellipse or a rectangle.

In this example, the parts other than the newly provided magnetic poles were magnetized with a sleeve made of a material with high magnetic permeability such as pure iron. Any method that provides a suitable magnetic pole may be used.

The number of new magnetic poles is not limited to four as in this embodiment, but may be one or more.

Furthermore, if the magnet material is ferrite or the like, the entire ring-shaped magnet may be covered with plastic, metal such as nickel, or the like.

〔effect〕

According to the present invention, since the magnetic attraction force around the ring-shaped magnet is almost uniform, when a rod-shaped object such as a nail is attracted, the contact area increases and the whole can be held in close contact and captured in a recumbent state. When the protruding metal foreign object comes into contact with the stomach wall, it can be retracted along the magnet without puncturing the stomach wall. Furthermore, since the magnetic flux density in the space is higher than that in the outer periphery, the foreign metal objects attracted to the outer periphery can be moved to the space, and the foreign metal objects can be reliably captured in the inner space.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a plan view showing the mounting position of the sleeve and lines of magnetic force, and FIG. 2 is a perspective view showing the sleeve in an open state. In the drawings, reference numeral 1 is a magnet, 2 and 3 are tips, 4 is a sleeve, 5 is a gap in which the magnet is inserted, 6 is a gap between the sleeves, a new magnetic pole part, and 7 is a space.

Claims (1)

[Claims] 1 A vertically elongated ring-shaped magnet made of a bar-shaped magnetic material and integrally formed in an annular shape, with magnetic poles surrounding at least one pair of magnetic materials provided between the magnetic poles provided at both ends in the length direction. A ring-shaped magnet for attracting foreign bodies in the stomach.